光合作用
生物
光呼吸
代谢组
新陈代谢
鲁比斯科
生物化学
光合能力
氨基酸
气孔导度
氮同化
植物
酶
代谢物
作者
Wenshi Hu,Zhifeng Lu,Fanjin Meng,Xiaokun Li,Rihuan Cong,Tao Ren
出处
期刊:Plant Science
[Elsevier]
日期:2021-06-01
卷期号:307: 110891-110891
被引量:13
标识
DOI:10.1016/j.plantsci.2021.110891
摘要
Potassium (K) regulates plant metabolism and enhances plant’s ability to adapt to adversity. However, under different K deficiency stress, the net photosynthetic rate (An) was reduced, influenced by CO2 conductance or biochemical capacities. The interplay between metabolome and photosynthetic characteristics under K deficiency stress was analyzed to explore the mechanisms by which K regulates photosynthetic capacity. With increasing K deficiency stress, dominations limiting An varied from CO2 conductance to biochemical limitations. Multivariate analyses indicated that organic acids, amino acids and sedoheptulose-7-bisphosphate were significantly related to An, CO2 conductance and carboxylation rate. Under moderate K deficiency, organic acids were up-regulated. Acidification of subcellular compartments reduced sedoheptulose-1,7-bisphosphatase activity, inducing downregulation of sedoheptulose-7-bisphosphate and hindrance of ribulose bisphosphate regeneration. Moreover, increased CO2 shortage with increasing K deficiency induced a shift of increased citric acid to amino acid synthesis, causing excessive accumulation of amino acids. In addition, the reduced serine level indicated impaired photorespiration. These two changes triggered more serious reduction in photosynthetic capacity. The intimate, changes in photosynthetic capacities were tightly coupled with shifts in central C metabolism, which provides insights into the methods used to enhance An and plant’s adaptability to abiotic stresses, through the regulation of C metabolites using molecular technology.
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